[rom, rom_ext] Re-arrange retention RAM #21343
Merged
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Re-arrange the retention RAM as discussed in the SW WG meeting on 2024-02-13:
Locate the boot_svc message first, followed by reserved space, followed by the boot_log and last_shutdown_reason. This arrangement allows us to grow the boot_svc message (growing "down" into the reserved space) if needed and to add additional fields at the end (growing "up" into the reserved space).